converted SgmlReader & NReadability to PCL; start reader project

PortablePorts/NReadability/WebTranscodingInput.cs

@@ -0,0 +1,27 @@
+using System;
+
+namespace NReadability
+{
+  public class WebTranscodingInput
+  {
+    private DomSerializationParams _domSerializationParams;
+
+    public WebTranscodingInput(string url)
+    {
+      if (string.IsNullOrEmpty(url))
+      {
+        throw new ArgumentException("Argument can't be null nor empty.", "url");
+      }
+
+      Url = url;
+    }
+
+    public string Url { get; private set; }
+
+    public DomSerializationParams DomSerializationParams
+    {
+      get { return _domSerializationParams ?? (_domSerializationParams = DomSerializationParams.CreateDefault()); }
+      set { _domSerializationParams = value; }
+    }
+  }
+}